Loss tangent
The high values of dielectric constant and dielectric loss at low frequencies is attributed to the presence of electrode polarization phenomenon. The decrease of dielectric constant and dielectric loss in the high frequency regime is attributed to the inability of the dipoles to follow the fast changing electric field. Fig. 5(c) shows the variation of Tan d with frequency for Starch/PVA polymer electrolyte films with different contents of silica at room temperature. Appearance of peaks in the tan delta spectra is an important evidence of the relaxation process prevalent in the system. The relaxation frequency has been described as an efficacious probe to investigate the local flexibility of the polymer chains. The shift in the peaks suggests that the interaction of the silica with the polymer matrix reduces the relaxation time of the ionic species which promotes conductivity at room temperature [38].